Technology for Sustainable Cities, Companies and Responsible Consumers

A special issue of Clean Technologies (ISSN 2571-8797).

Deadline for manuscript submissions: 31 December 2025 | Viewed by 588

Special Issue Editors


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Guest Editor
Faculty of Engineering Management, Poznan University of Technology, Jacka Rychlewskiego 2, 60-965 Poznan, Poland
Interests: smart city development; project management; foresight; technological culture; enterprise development; network economy
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Faculty of Engineering Management, Poznan University of Technology, Jacka Rychlewskiego 2, 60-965 Poznan, Poland
Interests: circular economy business models; circular practices; remanufacturing; sustainable supply chain; sustainable mobility; reverse logistics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue focusses on the role of clean technologies in advancing sustainability in urban environments, corporate practices, and consumer lifestyles. Global challenges such as climate change and resource depletion have created the need for innovative technologies and solutions that reduce environmental footprints, such as renewable energy, energy-efficient systems, circular manufacturing, remanufacturing, and sustainable mobility. In cities, smart technologies, green infrastructure, and low-carbon transportation are transforming urban sustainability. In addition, companies are adopting circular economy principles, eco-friendly production methods, remanufacturing, and carbon-neutral strategies to enhance their corporate responsibility. Consumers are creating demand for sustainable products and services through conscious consumption and digital engagement. This Special Issue presents state-of-the-art research, case studies, and policy insights that highlight how clean technology is redefining industries and everyday life. By fostering interdisciplinary dialog, it aims to promote scalable, technology-driven sustainability solutions for a more sustainable future.

Dr. Magdalena Wyrwicka
Dr. Paulina Golinska-Dawson
Guest Editors

Manuscript Submission Information

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Keywords

  • sustainable city
  • sustainable mobility and transport
  • smart technologies for sustainability
  • Industry 5.0
  • smart and circular practices and technologies
  • zero-emission practices and technologies
  • carbon footprint
  • digital technologies for reverse logistics
  • sustainable company
  • responsible consumer

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Published Papers (1 paper)

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Research

23 pages, 5798 KB  
Article
Effect of Detergent, Temperature, and Solution Flow Rate on Ultrasonic Cleaning: A Case Study in the Jewelry Manufacturing Process
by Natthakarn Juangjai, Chatchapat Chaiaiad and Jatuporn Thongsri
Clean Technol. 2025, 7(4), 83; https://doi.org/10.3390/cleantechnol7040083 - 1 Oct 2025
Viewed by 222
Abstract
This research investigated how detergent type and concentration, solution temperature, and flow rate affect ultrasonic cleaning efficiency in jewelry manufacturing. A silver bracelet without gemstones served as the test sample, and the study combined harmonic response analysis to assess acoustic pressure distribution with [...] Read more.
This research investigated how detergent type and concentration, solution temperature, and flow rate affect ultrasonic cleaning efficiency in jewelry manufacturing. A silver bracelet without gemstones served as the test sample, and the study combined harmonic response analysis to assess acoustic pressure distribution with computational fluid dynamics to examine fluid flow patterns inside an ultrasonic cleaning machine. Cleaning tests were performed under real factory conditions to verify the simulations. Results showed that cleaning efficiency depends on the combined chemical and ultrasonic effects. Adding detergent lowered surface tension, encouraging cavitation bubble formation; higher temperatures (up to 60 °C) softened dirt, making removal easier; and moderate solution flow improved the cleaning, helping to carry dirt away from jewelry surfaces. Too much flow, however, decreased cavitation activity. The highest cleaning efficiency (93.890%) was achieved with 3% U-type detergent at 60 °C and a flow rate of 5 L/min, while pure water at room temperature (30 °C) without flow had the lowest efficiency (0.815%), confirmed by weighing and scanning electron microscope measurements. Interestingly, maximum ultrasonic power concentration did not always match the highest cleaning efficiency. The study supports sustainable practices by limiting detergent use to 3%, in line with Sustainable Development Goal (SDG) 9 (Industry, Innovation, and Infrastructure). Full article
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